Now we are going to add some noise. Go to filter>noise>add noise. Set the amount between 20-25%, change the distribution to gaussian. The image I am working on is of massive dimension (2896 X 1944) that’s why I am choosing my amount between 20-25%. If you are working on smaller dimension image that was shot using smartphones than you may choose your amount between 10-15%. Press OK.
Change the blend mode of “noise” layer to screen.
I have written a whole tutorial on Blending Modes in Photoshop and you should check that tutorial out if you are not aware of the power of Blending Modes.